Lucia from the United States explained:
1 - North American long distance prefix
758 - area code assigned to St. Lucia
local phone number - 7 digits
US to St. Lucia international dialing format:
1 758 ??? ????
this country is in the North American Numbering
Plan (calling it works like a US long distance call)...however,
international or sometimes unexpected charges may apply when calling numbers in area code 758!